Personalized Unicycle Irish Shamrock Men's V-Neck T-Shirt. A unicycle against an image of an Irish shamrock is a unique Irish gift design for bicyclists on birthdays and St. Patrick's Day. 4.7 oz., 100% pre-shrunk cotton Narrow, set-in 1x1 mitered V-neck collar Shoulder-to-shoulder taping Double-needle stitched sleeves and bottom hem